Switching between a Vps/Dedi to a Cloud service (Like AWS/Google)

Im planning to host my app on a vps or a dedi but at the same time i want some security if there is downtime with the vps. is there a way i can host the app on the dedi and whenever there is any outage of any sort with the dedi the cloud takes over and there is no outage.

Thanks for the help!